我正在尝试通过向按钮添加线性渐变来创建漂亮的UI按钮。但是我不确定应该在哪个索引处添加渐变。目前我的代码将渐变放置在图像/文本上面。
如何向UIButton插入一个子层,使其位于文本/图像子层下方?对我来说保持按钮的文本和图片可见非常重要!
+(void)addLinearGradientToView:(UIView*)view TopColor:(UIColor*)topColor BottomColor:(UIColor*)bottomColor
{
for(CALayer* layer in view.layer.sublayers)
{
if ([layer isKindOfClass:[CAGradientLayer class]])
{
[layer removeFromSuperlayer];
}
}
CAGradientLayer* gradientLayer = [CAGradientLayer layer];
gradientLayer.startPoint = CGPointMake(0.5, 0);
gradientLayer.endPoint = CGPointMake(0.5,1);
gradientLayer.frame = view.bounds;
gradientLayer.colors = [NSArray arrayWithObjects:(id)[topColor CGColor], (id)[bottomColor CGColor], nil];
// [view.layer addSublayer:gradientLayer];
if(view.layer.sublayers.count>0)
{
[view.layer insertSublayer:gradientLayer atIndex:view.layer.sublayers.count-2];
}else {
[view.layer addSublayer:gradientLayer];
}
}